Combined reverse and reduction gear



Dec. 4, 1928. 11,693,645

E. H. FAHRNEY COMBINED REVERSE AND REDUCTION GEAR Filed Feb. 7, 1927A 3 Sheets-Sheet 1 1293 :a if

Dec. 4, 1928.

` m6939645 E. H. FAHRNEY COMBINED REVERSE AND REDUCTION GEAR Filed Feb. 7, 192? 3 Sheets-.Sheet 2 il; @a

Dec. 4, 192s. www5 E. H. F AHRNEY v COMBINED REVERSE AND REDUCTION GEAR Filed Feb. 7, 1927 3 Sheetslsheet 5 jade72/@LCV MW/257mm aient e@ "4 1928' ,or caso, a

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i non e Application filed February 19a?. En. lm.

, a one of the objects of the ,invention is to pro-1 vide an improved gear yof this character in which the friction clutch of the .engine and f the reversing gear' will be controlled and shifted by means of a single operating leverJ le the clutc es -for the respective gears being rendered active in advance of the friction v clutchof the engine.

A further object is to provide an improved marine reversin gear` of this character which is provi ed with a plurality of clutches which are adapted to be controlled by a single cam element, which cam element operates through the medium of clutches for rendering the respective gears active and in- 2u active A further object is to rovide an improved gear of th'isoharacter 'w ich will be comparatively-simple and compact in construction and eifective and efficient in operation..

'To the attainment of these ends and the accomplishment of other new and useful objects as will appear, the invention consists in the features of novelty in substantially the construction, combination and-arrangement 3a of the several parts hereinafter more fully described and claimed and shown in the accompanying drawings illustrating this -invention, and in which e v Figure 1 is a view partly in verticalsection and partly in elevation of a gearing constructed inaccordance with the principles of this invention and showing the parts in a neutral position.

Figure 2'is a view similar to Figure 1,

. l showing the parts in position for a forward motion.`

Figure 3 is a view similar to Figure 1, showing the parts in position for .reverse or backward movement.

Figure 4 is an enlarged detail view similar to Figure 1,' with the parts in another vposition.

Figure 5 is a sectional view taken on line 5 5, Figure 4. y

Figure 6 is an enlarged detail sectional view taken on line 6f6,` Fi re 9. Figure 7 is a view in si e elevation of a 'portion of an engine having a gearing of this character constructed in 4accordance with the principles of'l this invention, applied 55 thereto. I

Fi'zgure 8 is a'view taken on line 8-8, Figure Figure 9 is an enlarged detailed elevation of the cam device.

Referring more particularly tothe drawings the numeral 10 designates an engine having a driving shaftll towhich isconnected an ordinary. friction clutch-member 12.

A shaft 13'is journaled insuitable bearings 14 in the walls of a casing 15, and this shaft 13 is arranged in -alinement with the shaft 11.

Keyed tothe shaft 13 is a friction clutch member 16, which (1KG-operates with the clutch member 12 for fric ionally locking the shafts 11 and 13 together.

The clutchmember 16 is normally moved in adrection toward'the clutch member 12 by means of a suitable spring 17, and they clutc member 16 is moved against the stress of the spring 17 and out of operative contact'with the cinteh member 12 by means of a'lever 18 pivotally supported as at 19 intermediate its ends, one end of the lever being connected with the clutch member 16.

Loosely mounted Iupon the shaft 13 is a gear 20 which is heldpagainst longitudinal movement on' the shaft 13 in any suitable manner.

The gear 20 is provided with a clutch face V21 and another gear 22 is looselymounted upon the shaft 13 and is provided with a clutch face 23.

The gears 20 and 22 and the respective clutch faces 21 and 23 are spaced from each other longitudinally of the shaft 13. Intermediate these gears and keyed to the shaft 13 for longitudinal movement thereu on is a5 a clutch member` 24' having a clutch ace 25 4 adapted to co-operate with the clutch face 21 of the gear 20, and a' clutch face 26 adapted to co-operate with the clutch face23 of the gear 22.

A shaft 27 is also journaled in suitable bearings 28 in the walls of the casing ,15 and is arranged parallel with the shaft 13. To the end of the shaft 27 is connected a v propeller shaft 29, preferablythrough the medium of a universal joint 30, and this shaft carries a propeller 31. Loosely mounted upon the shaft 27 and in alinement with the gear 20, is a 'gear 32 which is provided. with a clutch face 33. Intermediate the gears 20 and 32 is a gear 34 which meshes with both of the gears 2O and 32.

Secured to the shaft 27 for rotation therewith is a gear which meshes with a gear 22, and this gear 35 is spaced from the gear 32 in a direction lengthwise of the shaft 27.

A clutch member 36 is keyed to the shaft 27 -between the gears 35 and 32, and the clutch Amember 36 is provided with a clutch face 37 adapted to co-operate with the clutch face 33 of the gear 32 for locking the gear 32 for. rotation with the shaft-27. Y

The clutch members 24 and 36 are adapted to be shifted upon their respective shafts'and into and out of engagement with the clutch members of the res ective gears, by means of a lever 38,1which- 1s pivotally supported intermediate its ends 39 preferably by means of a bracket 40.

Links 41 are preferably .provided with anti-friction rollers" 42-43 which project into and operate within peripheral grooves in the' respective clutch members 24-36. These linksl41 are 'connected by means of a rod 44 to the ends of which rod are pivotally connected the extremities of a yoke 45 formed on the end of the lever 38 so that when the lever 38 is rocked about its pivot 39, both of the clutch members 24 and 36 will be simultaneously `shifted upon their respective shafts 13 and 27 and in the same direction so as to lock or unlock predetermined ones of the gears with relation to their respective shafts.

The lever 38 is adapted to be rocked about its pivot by means of a cam element 46 which is provided withY a groove 47 opening ythrough one face thereof, as indicated in Figure 6; A portion of the groove 47'adjacent one end thereof is formed on a radius described from the center of the axis of the cam element 46 as at 48, while another por- 'radius on .the

tion 49 of the groove adjacent the other end thereof is described on the radius described from the center of the 'axis` of the cam element 46, and which radiusis shorter than the radius of theportion 48Eof the groove.l Intermediate these portions 48and 49, the groove is formed on another radius .which is concentric with the axis of the camelement 46,- as at 50, and which radius is of a length somewhat eater. than the length of the w 'ch the portion 49 of the groove is shaped, but-less than the radius on which portion v48 of the groove is shaped. Carried. by the free end of theflever 38 j is an anti-friction roller 51 which operates j inthe groove-47 and thecam element is Lacasse The groove 47 is arranged preferably adjacent one end of the cam element 46 and the other extremity or edge 54 of the cam i element is shaped to form an operating surface against which an anti-friction roller 55 carried by the free end of the lever 18, operates. 4

The edge or surface 54 of the cam ics provided adjacent its extremities with recesses 56 and 57, adapted to'receive the roller 55, the roller being moved into these recesses, when they are 1n alinement with the roller, byjmeans of the spring 17 which controls the clutch member 16. Y

When the ro1ler 55v is moving over the surface 54 the clutch member 16 will be shifted against the stress of the spring 17,

so that the friction clutch will berendered inactive, but when the rollerfenters one or the other of the recesses 564-57, the spring 17 will also move the-clutch member 16 into frictional locking engagement with the clutch 12 to frictionally lock the shafts 1l and 13 for rotation together.

If desired a recess 58 may be provided in the surface 54 of the cam velement inter-v members are locking the respective gears tov the shafts. j

It is thought that the operation of this mechanism will be clearly understood from the foregoing, but briefly stated it is as follows. j

Assuming the parts to be in the position shown inFigure 1, which is the neutral position, the roller 51 on the lever 38 will be in the concentric portion 50 of the groove 47 andthe clutch members24 and 36 will he in inactive positions with respect to thecooperating gears, which will 'cause thel gears 20, 22 and 32 to be unlocked with relation to i their respective shafts 13 and 27, while the gear 35 will be locked foirotation with the shaft 27. At the same time the clutch members 16'and 12 will be in`inope`rative -positions withres'pectito each other.A

In order to cause the shaft 29 to rotate to A propel forwardly'the lever. 52 'is shifted to thel position shown in Figure2. This will` active.

and 27,

imams y cause therollerI 51 to ride into the portion 49 of the groove' 47, with the result that the lever 38 will be rocked so as to move the clutch member 24 on the shaft 13,- sothat itv willlocl the gear 22l with the shaft 13. During this roller 55 will roll over the portion 54 of the cam element until the recess v56 is in position to receive the roller'55'.v The entering of the roller 55 into the recess' 56 will cause the clutch membersl16 and 12 to be frictionally locked so that: the motion of the engine shaft 11 will be transmitted through the friction clutch 12-16 to the'shaft 13, through the clutch member 24 to `the gear 2 2, thence to the gear 35, which is locked to the shaft 27.

If the lever 52 is moved in the opposite direction when the parts are in the position shown-in Figure 1, the parts will assume the position shown in Figure 3, which will cause the vgears 2O and-32 to be respectively locked by their clutches 24 and 36 to the shafts 13 thereby causing the shaft 29 to be rotated in the opposite direction by reason of the fact that the intermediate ear 34 y will cause a reverse movement of the s aft 27.

11 ally With this improved construction it wi be manifest that there is provided a simple and compact combined reversing and reduction gear, all of thek parts of which are controlled by a single operating lever, that .is the engine friction clutch and the gear Vclutches will be simultaneouslyactuated, but the parts are so arranged that the gear 'clutches will be in operative engagement before the friction clutch 16--12 is rendered ln other words, the `cam element which controls the operation of these clutches is so designed that the clutches 24 and 36 will move so as to engage the clutch faces on the respective gears 22, 20, and 32 first, lafter which the'fricjtionclutch 16-12 will become active.

lt will be noted' that the gear 32 is loosely mounted upon the shaft 27 and is connected with this shaft for rotation therewith, by meansV of the clutch'36.' Y Gne ofthe objects in loosely mounting this gear 32 on the shaft is so that thegear 32,can be engaged or locked with the clutch 36 at the same time that the gear 20 is locked to the shaft .13 by the clutch 24. With this construction and arrangement the gears 20 and 32 will idle on their respective shafts when the propeller shaft is connected Awith the shaft 13 through `the medium of the gears 22 and 35 for a forward drive.

While the preferred form of the invention has'been' hereln-shown and described, it is to be understood that various changes may' be, made in the details of construction and in the combination and arrangement of the movement'of the clutch 24 the.

n shaft,

controlling said connection, a reverse drive connection between said shafts, clutch mechanism for controlling the last recited connection, a lever device common to said clutch connections .for controlling them, a power shaft, a clutch connection between the ower shaft and said driving shaft, a lever evice for controlling the last recited clutch connection, a single pivotally mounted cam lement, said cam elementhaving threedistinct surfaces formed on different radii and operating upon the rst recited lever device, a separate cam surface on the cam element operating upon'the second recited lever device, and means for swinging the cam element about its pivot.

2. lin combination, a power shaft, a driven shaft, a plurality of clutch connections between said shafts, a plurality of lever devices individual to certain of said clutch connections for controlling them, a single pivotmounted cam device common to said lever devices for controlling them, and means for moving the cam device about its pivot, said cam device having a plurality of faces struck on different radii from'the pivot of the cam, and each operating upon one of the said lever devices for causing the clutch connections controlled ,by the lastl recited lever device to assume perdetermined positions. f

3. ln combination, a ower shaft, a driven shaft, a plurality of c utch connections between said shafts, a plurality of'lever devices individual to certain of said clutch connectioiis for controlling them, a single pivotally @mounted cam device common to said lever devices for controlling Lhem, and means for moving the' cam device about its pivot, said cam device having a plurality of aces struck cn difderent radii from the pitot of the cam' and each operating upon one of the said lever devices for causing the clutch connections controlled by the last recited lever device to assume predetermined positions, the said carn'device also operating to cause certain of the clutch connections to become active in advance of others of said clutch connections.

4. In combination,` a powershaft, a driven a plurality of clutch connections between said shafts, a plurality of lever devices individual to certain of said clutch connections for controlling them, a single 4pivotally mounted cam device common to ill@ liti

faces struck on diderent radii from the pivot of the cam and all operating upon one of the Said lever devices for causing the clutch connections controlled by the lastprecited lever'A device to assume predetermined positions, the said cam device also having a surface operating on the othei` of said lever devices for rendering the clutch controlled thereby Legame inactive, the last recited surface of the cam device being provided with a formation for 10 maintaining the last recited clutch connection ina neutral position. f

In testimony whereof," I have signed my lname to this specification, on this 22nd day of January, 1927.

v EMERY H. FAHRNEY. 

